Analytical foundations of current-feedback amplifiers

Abstract

Current-feedback amplifiers (CFAs), also called transimpedance amplifiers, are a special type of operational amplifier (op-amp) which exploit clever circuit topologies in conjunction with high-speed complementary bipolar processes in order to achieve extremely fast dynamics, such as gain-bandwidth products in the gigahertz range and settling times to 0.1% in the 10 ns range. The analytical foundations of CFAs are discussed. Specific topics include CFA dynamics, second-order effects, noise in CFAs, and application considerations.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>